Mars24 Sunclock — Time on Mars

Mars24 was developed at the NASA Goddard Institute for Space Studies by Robert B. Schmunk based on algorithms derived by Michael D. Allison.

Acknowledgements & References

We thank members of the Mars Climate Orbiter and Mars Exploration Rover projects at NASA's Jet Propulsion Laboratory (JPL) for their assistance and encouragement in the development of Mars solar timing algorithms and the Mars24 sunclock.

We thank members of the Mars Phoenix project at NASA/JPL and the University of Arizona and members of the MSL Curiosity project at NASA/JPL and the Johns Hopkins University for their assistance in updates to Mars24 related to those projects' timekeeping.

We thank B. Semenov at NASA/JPL for his assistance in updates related to Mars InSight and Mars 2020 Perseverance project timekeeping.

Java Software Code Libraries

Mars24 uses several third-party, open-source Java libraries, provided under various licenses as listed. You may obtain the source code for these libraries at the URLs provided.

Apache PDFBox (pdfbox and fontbox), version 2.0.21.
Copyright © 2009-2020 the Apache Software Foundation. Available at pdfbox.apache.org. Used under terms of the Apache License, version 2.

JDOM library, ver. 2.0.6.
Copyright © 2000-2015 Jason Hunter and Brett McLaughlin. Available at www.jdom.org. Used under terms of a modified Apache License.

JH Labs Image Filters.
Copyright © 1998-2006 Jerry Huxtable. Available at www.jhlabs.com/ip/filters. Used under terms of the Apache License, Version 2.0.

pdfbox-graphics2d, version 0.31.
Copyright © 2017-2021 Emmeran Seehuber. Available at github.com/rototor/pdfbox-graphics2d. Used under terms of the Apache License, version 2.

Simple Logging Facade for Java (SLF4J), version 1.7.30.
Copyright © 2004-2019 QOS.ch. Available at www.slf4j.org. Used under terms of the MIT license.

References

The Mars24 is primarily based on algorithms published in:

Updates and adjustments post-2004 have been made based on:

Other works useful in the development of the Mars timekeeping algorithm and the Mars24 software, including landing site data and mission clocks, include:

Mission clock information for NASA's Mars Phoenix was provided by M. Garcia (2007-09) and K. Fujii (2008-05).

Mission clock information for NASA's MSL Curiosity was provided by S. Krasner (2012-02) and B. Semenov (2012-07).

Mission clock information for NASA's InSight was provided by B. Semenov (2018-02, 2018-11, 2019-04).

Mission clock information for NASA's Mars 2020 Perseverance was taken from a NASA/JPL/NAIF/SPICE document by Acton & Semenov dated August 2020.

Sunclock Map Images

The "MOC_MOLA_NGS_Map" sample map is derived from an image created by Malin Space Science Systems by combining Mars Global Surveyor (MGS), Mars Orbiter Camera (MOC) and Mars Orbiter Laser Altimeter (MOLA) data for a map to be used by the National Geographic Society. The base image was obtained from the MOLA Science website and re-projected.

The color topography shaded map was created by the MGS MOLA team and was also obtained from the MOLA Science website.

The "VIS_MDIM_1_Map" sample map was obtained from the USGS Astrogeology Research Program "Map-a-Planet" PDS Imaging Node and is a combination of Viking project Visual Image Subsystem (VIS) color imagery with Viking Mars Digital Image Model Version 1 (MDIM1) data.

The "VIS_MDIM_2.1_Map" sample map was obtained from the USGS Astrogeology Science Center and is a combination of Viking project Visual Image Subsystem (VIS) color imagery with Viking Mars Digital Image Model Version 2.1 (MDIM2.1) data.

Landing Site Panorama Images

The local panorama images at three lander sites are derived from panorama images released by the lander projects.

The MER-A panorama uses image PIA05199 in the NASA Planetary Photojournal, and the MER-B panorama uses image PIA05049. These images are courtesy NASA/JPL/Cornell.

The Phoenix panorama combines two images, the black and white image PIA10733 released May 29, 2008, and color image PIA11007 released July 31, 2008. The Phoenix images are courtesy NASA/JPL-Caltech/University of Arizona/Texas A&M University.

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